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Technical

6P6C Main Unit to Panel Unit Pinout
Pin	Name	Description
1	MOD	Buffered Modulation (AF) Input (~2.2kΩ source impedance)
2	POWERSW	Active-low (pulled through 1KΩ resistor) momentary power switch signal
3	9V	9VDC regulated supply voltage for Panel Unit
4	GND	Ground
5	RXD	Head unit Asynchronous serial (19.2 kbps 8N1) Receive
6	TXD	Head unit Asynchronous serial (19.2 kbps 8N1) Transmit

6P6C Panel Unit microphone connector
Pin	Name	Description
1	SW2	Matrix keypad column input
2	SW1	Matrix keypad row input
3	9V	9VDC regulated supply voltage
4	GND	Ground
5	MIC	Electret microphone audio input
6	PTT	Active-low push-to-talk switch

Measured parameters
Parameter (Unit)	Description	Value
Communication	Asynchronous communication	19.2 kbps 8-N-1 (8 data bits, no parity, 1 stop bit)
Head unit update period (ms)	Time between start of panel unit TX packet to start of next packet	TBD (on order of 20)
Main unit update period (ms)	Time between start of main unit TX packet to start of next packet	TBD (on order of 40)
Watchdog Time (s)	Minimum time between last update packet from panel unit and when main unit shutdowns (powers off)	TBD

Panel Unit packet structure
Octet	0	2	7
0	Left encoder count since update (2's complement - CW is positive)		SBZ
1	Right encoder count since update (2's complement - CW is positive)		SBZ
2	PTT input ADC 7Fh ~ PTT disabled 1Bh ~ PTT enabled		SBZ
3	Right squelch ring ADC (7Fh: open squelch)		SBZ
4	Right volume control ADC (7Fh: max volume)		SBZ
5	SW1 keypad matrix row ADC 00h: 1-A 1Ah: 4-B, UP 32h: 7-C, DOWN 4Ch: *-D 64h: P1-P4 7Fh: inactive		SBZ
6	Left squelch ring ADC (7Fh: open squelch)		SBZ
7	Left volume control ADC (7Fh: max volume)		SBZ
8	SW2 keypad matrix column ADC 06h: UP/DWN 1Bh: 1-*,P1 33h: 2-0,P2 4Ch: 3-#,P3 67h: A-D,P4 7Fh: inactive		SBZ
9	Panel right-side (multiplexed) buttons 00h: SCN 20h: HM 40h: V/M 60h: LOW 7Fh: none		SBZ
10	Panel left-side (multiplexed) buttons 00h: LOW 20h: V/M 40h: HM 60h: SCN 7Fh: none		SBZ
11		SET key	SBZ